drivers/rtc/rtc-pcf8523.c

1 // SPDX-License-Identifier: GPL-2.0-only
26 #define PCF8523_CONTROL3_BLF BIT(2) /* battery low bit, read-only */
57 	u32 load, value = 0;  in pcf8523_load_capacitance()  local
59 	load = 12500;  in pcf8523_load_capacitance()
60 	of_property_read_u32(node, "quartz-load-femtofarads", &load);  in pcf8523_load_capacitance()
62 	switch (load) {  in pcf8523_load_capacitance()
64 		dev_warn(&pcf8523->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 12500",  in pcf8523_load_capacitance()
65 			 load);  in pcf8523_load_capacitance()
74 	return regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,  in pcf8523_load_capacitance()
84 	err = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL2, &value);  in pcf8523_irq()
90 		regmap_write(pcf8523->regmap, PCF8523_REG_CONTROL2, value);  in pcf8523_irq()
91 		rtc_update_irq(pcf8523->rtc, 1, RTC_IRQF | RTC_AF);  in pcf8523_irq()
105 	err = regmap_bulk_read(pcf8523->regmap, PCF8523_REG_CONTROL1, regs,  in pcf8523_rtc_read_time()
111 		return -EINVAL;  in pcf8523_rtc_read_time()
113 	tm->tm_sec = bcd2bin(regs[3] & 0x7f);  in pcf8523_rtc_read_time()
114 	tm->tm_min = bcd2bin(regs[4] & 0x7f);  in pcf8523_rtc_read_time()
115 	tm->tm_hour = bcd2bin(regs[5] & 0x3f);  in pcf8523_rtc_read_time()
116 	tm->tm_mday = bcd2bin(regs[6] & 0x3f);  in pcf8523_rtc_read_time()
117 	tm->tm_wday = regs[7] & 0x7;  in pcf8523_rtc_read_time()
118 	tm->tm_mon = bcd2bin(regs[8] & 0x1f) - 1;  in pcf8523_rtc_read_time()
119 	tm->tm_year = bcd2bin(regs[9]) + 100;  in pcf8523_rtc_read_time()
130 	err = regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,  in pcf8523_rtc_set_time()
136 	regs[0] = bin2bcd(tm->tm_sec);  in pcf8523_rtc_set_time()
137 	regs[1] = bin2bcd(tm->tm_min);  in pcf8523_rtc_set_time()
138 	regs[2] = bin2bcd(tm->tm_hour);  in pcf8523_rtc_set_time()
139 	regs[3] = bin2bcd(tm->tm_mday);  in pcf8523_rtc_set_time()
140 	regs[4] = tm->tm_wday;  in pcf8523_rtc_set_time()
141 	regs[5] = bin2bcd(tm->tm_mon + 1);  in pcf8523_rtc_set_time()
142 	regs[6] = bin2bcd(tm->tm_year - 100);  in pcf8523_rtc_set_time()
144 	err = regmap_bulk_write(pcf8523->regmap, PCF8523_REG_SECONDS, regs,  in pcf8523_rtc_set_time()
152 		regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,  in pcf8523_rtc_set_time()
157 	return regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,  in pcf8523_rtc_set_time()
168 	err = regmap_bulk_read(pcf8523->regmap, PCF8523_REG_MINUTE_ALARM, regs,  in pcf8523_rtc_read_alarm()
173 	tm->time.tm_sec = 0;  in pcf8523_rtc_read_alarm()
174 	tm->time.tm_min = bcd2bin(regs[0] & 0x7F);  in pcf8523_rtc_read_alarm()
175 	tm->time.tm_hour = bcd2bin(regs[1] & 0x3F);  in pcf8523_rtc_read_alarm()
176 	tm->time.tm_mday = bcd2bin(regs[2] & 0x3F);  in pcf8523_rtc_read_alarm()
177 	tm->time.tm_wday = bcd2bin(regs[3] & 0x7);  in pcf8523_rtc_read_alarm()
179 	err = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL1, &value);  in pcf8523_rtc_read_alarm()
182 	tm->enabled = !!(value & PCF8523_CONTROL1_AIE);  in pcf8523_rtc_read_alarm()
184 	err = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL2, &value);  in pcf8523_rtc_read_alarm()
187 	tm->pending = !!(value & PCF8523_CONTROL2_AF);  in pcf8523_rtc_read_alarm()
196 	return regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL1,  in pcf8523_irq_enable()
211 	err = regmap_write(pcf8523->regmap, PCF8523_REG_CONTROL2, 0);  in pcf8523_rtc_set_alarm()
215 	regs[0] = bin2bcd(tm->time.tm_min);  in pcf8523_rtc_set_alarm()
216 	regs[1] = bin2bcd(tm->time.tm_hour);  in pcf8523_rtc_set_alarm()
217 	regs[2] = bin2bcd(tm->time.tm_mday);  in pcf8523_rtc_set_alarm()
220 	err = regmap_bulk_write(pcf8523->regmap, PCF8523_REG_MINUTE_ALARM, regs,  in pcf8523_rtc_set_alarm()
225 	if (tm->enabled)  in pcf8523_rtc_set_alarm()
226 		return pcf8523_irq_enable(dev, tm->enabled);  in pcf8523_rtc_set_alarm()
237 	switch (param->param) {  in pcf8523_param_get()
239 		ret = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL3, &value);  in pcf8523_param_get()
248 			param->uvalue = RTC_BSM_LEVEL;  in pcf8523_param_get()
252 			param->uvalue = RTC_BSM_DIRECT;  in pcf8523_param_get()
255 			param->uvalue = RTC_BSM_STANDBY;  in pcf8523_param_get()
258 			param->uvalue = RTC_BSM_DISABLED;  in pcf8523_param_get()
264 		return -EINVAL;  in pcf8523_param_get()
275 	switch (param->param) {  in pcf8523_param_set()
277 		switch (param->uvalue) {  in pcf8523_param_set()
291 			return -EINVAL;  in pcf8523_param_set()
294 		return regmap_update_bits(pcf8523->regmap, PCF8523_REG_CONTROL3,  in pcf8523_param_set()
301 		return -EINVAL;  in pcf8523_param_set()
317 		ret = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL3, &value);  in pcf8523_rtc_ioctl()
324 		ret = regmap_read(pcf8523->regmap, PCF8523_REG_SECONDS, &value);  in pcf8523_rtc_ioctl()
334 		return -ENOIOCTLCMD;  in pcf8523_rtc_ioctl()
345 	err = regmap_read(pcf8523->regmap, PCF8523_REG_OFFSET, &value);  in pcf8523_rtc_read_offset()
349 	/* sign extend the 7-bit offset value */  in pcf8523_rtc_read_offset()
362 	reg_m0 = clamp(DIV_ROUND_CLOSEST(offset, 4340), -64L, 63L);  in pcf8523_rtc_set_offset()
363 	reg_m1 = clamp(DIV_ROUND_CLOSEST(offset, 4069), -64L, 63L);  in pcf8523_rtc_set_offset()
365 	if (abs(reg_m0 * 4340 - offset) < abs(reg_m1 * 4069 - offset))  in pcf8523_rtc_set_offset()
370 	return regmap_write(pcf8523->regmap, PCF8523_REG_OFFSET, value);  in pcf8523_rtc_set_offset()
378 	if (client->irq > 0 && device_may_wakeup(dev))  in pcf8523_suspend()
379 		enable_irq_wake(client->irq);  in pcf8523_suspend()
388 	if (client->irq > 0 && device_may_wakeup(dev))  in pcf8523_resume()
389 		disable_irq_wake(client->irq);  in pcf8523_resume()
424 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))  in pcf8523_probe()
425 		return -ENODEV;  in pcf8523_probe()
427 	pcf8523 = devm_kzalloc(&client->dev, sizeof(struct pcf8523), GFP_KERNEL);  in pcf8523_probe()
429 		return -ENOMEM;  in pcf8523_probe()
431 	pcf8523->regmap = devm_regmap_init_i2c(client, &regmap_config);  in pcf8523_probe()
432 	if (IS_ERR(pcf8523->regmap))  in pcf8523_probe()
433 		return PTR_ERR(pcf8523->regmap);  in pcf8523_probe()
437 	rtc = devm_rtc_allocate_device(&client->dev);  in pcf8523_probe()
440 	pcf8523->rtc = rtc;  in pcf8523_probe()
442 	err = pcf8523_load_capacitance(pcf8523, client->dev.of_node);  in pcf8523_probe()
444 		dev_warn(&client->dev, "failed to set xtal load capacitance: %d",  in pcf8523_probe()
447 	err = regmap_read(pcf8523->regmap, PCF8523_REG_SECONDS, &value);  in pcf8523_probe()
452 		err = regmap_read(pcf8523->regmap, PCF8523_REG_CONTROL3, &value);  in pcf8523_probe()
457 			err = regmap_write(pcf8523->regmap, PCF8523_REG_CONTROL3,  in pcf8523_probe()
464 	rtc->ops = &pcf8523_rtc_ops;  in pcf8523_probe()
465 	rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;  in pcf8523_probe()
466 	rtc->range_max = RTC_TIMESTAMP_END_2099;  in pcf8523_probe()
467 	set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->features);  in pcf8523_probe()
468 	clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);  in pcf8523_probe()
470 	if (client->irq > 0) {  in pcf8523_probe()
473 		if (dev_fwnode(&client->dev))  in pcf8523_probe()
476 		err = regmap_write(pcf8523->regmap, PCF8523_TMR_CLKOUT_CTRL, 0x38);  in pcf8523_probe()
480 		err = devm_request_threaded_irq(&client->dev, client->irq,  in pcf8523_probe()
483 						dev_name(&rtc->dev), pcf8523);  in pcf8523_probe()
487 		dev_pm_set_wake_irq(&client->dev, client->irq);  in pcf8523_probe()
490 	wakeup_source = of_property_read_bool(client->dev.of_node, "wakeup-source");  in pcf8523_probe()
491 	if (client->irq > 0 || wakeup_source)  in pcf8523_probe()
492 		device_init_wakeup(&client->dev, true);  in pcf8523_probe()
512 		.name = "rtc-pcf8523",
521 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");